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A1309LLHLX-RP9-T Datasheet(PDF) 8 Page - Allegro MicroSystems |
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A1309LLHLX-RP9-T Datasheet(HTML) 8 Page - Allegro MicroSystems |
8 / 12 page Linear Hall-Effect Sensor ICs with Analog Output Available in a Miniature, Low-Profile Surface-Mount Package A1308 and A1309 8 Allegro MicroSystems, LLC 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com Undervoltage Lockout. The A1308 and A1309 provide an undervoltage lockout feature which ensures that the device out- puts a VOUT signal only when VCC is above certain thresholds. The undervoltage lockout feature provides a hysteresis of opera- tion to eliminate indeterminate output states. The output of the A1308 and A1309 is held low (GND) until VCC exceeds VUVLOHI. After VCC exceeds VUVLOHI, the device VOUT output is enabled, providing a ratiometric output voltage that is proportional to the input magnetic signal and VCC. If VCC should drop back down below VUVLOLO for longer than tUVLO after the device is powered up, the output would be pulled low (see Figure 3) until VUVLOHI is reached again and VOUT would be reenabled. VCC Ramp Time. The time taken for VCC to ramp from 0 V to VCC(typ), 5 V (see Figure 4). VCC Off Level. For applications in which the VCC pin of the A1308 or A1309 is being power-cycled (for example using a multiplexer to toggle the part on and off), the specification of VCC Off Level, VCCOFF, determines how high a VCC off voltage can be tolerated while still ensuring proper operation and startup of the device (see Figure 4). Figure 3: Definition of Undervoltage Lockout VOUT tUVLO VCC VUVLOHI VUVLOLO time time VCC(typ) VCCOFF 0 tVCC Figure 4: Definition of VCC Ramp Time, tVCC |
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